A resource updater can be used if the processing of resources changes
with regards to the entity id and the alias. This can be used by plugin
implementations to update this information.
The resource updater is called once when it is registered and picked up
by the OSGi installer with all known resource groups at this point of time.
The resource updater might be called more than once and therefore should
take action to either process the group as quickly as possible on further
invocation or unregister itself.